Rubezh

Any device whose MAC address begins with 40:F4:13 has a network interface built by Rubezh. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:F4:13

Organization

Rubezh

Address

Ulyanovskaya str. 28 Saratov RU 410056

Source

IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.